Maybe your zoom setting on your browser is zoomed out. Try holding down control and using your mouse wheel next time to see if that helps.
Browser Zooming.
Good suggestion. To assure more control...
CTRL and the + sign will ZOOM IN
CTRL and the - sign will ZOOM OUT
CTRL and 0 will reset browser to NORMAL.
Try CTRL and 0 to get back to normal, then see how things appear for you.